An interactive log for students and parents in my Pre-Cal 30S class. This ongoing dialogue is as rich as YOU make it. Visit often and post your comments freely.

Monday, January 09, 2006

Functions!

Well we started off the new year with a new unit. FUNCTIONS!A function is a rule that puts in an input and give only 1 output. You can determine its a function by doing a verticle test line, and if it touches the graph just once, then it is a function.

All functions are relations, but not all relations are functions.

An example of a relation, that is a function is:

An example of a relation, that is not a function is:

When Adding or Multipyling functions, order in which you put them in doesn't matter, this is called the Commutative Law.

When Subtracting or Dividing, order in which you put them in does matter because it can result in different answers.

With that said if you are given 2 elemenatary functions:

Adding them:

Subtracting them:

Mulitplying them:

Dividing them:

Well this is all I got for now, if there is anything missing or something is wrong, please feel free to correct me. It's the beginning of coming back from 2 weeks off, so there's probably more things missing then usual. (hehe..)